48 Dr. L. J. Sanford on the Gorilla. 
We regard the correct determination of the geological horizon 
to which these beds belong as the more important, inasmuch as 
it greatly simplifies the geological structure of the state, leaving 
the following subdivisions of the Devonian and Silurian systems 
in regular order of sequence: 
Black Slate. 
Hamilton Limestone. 
Oriskany Sandstone. 
Devonian, 
Niagara Limestone. 
Hudson River Shale. 
Siltriali, 3 eo Galena and Trenton Limestone. 
St. Peters Sandstone. 
Calciferous Sandstone. 
o beds referable to the Primordial or Taconic series have yet 
been observed during our investigations in Illinois. 
Springfield, Ilinois, Nov. 1861. 
ane 
Art. VIL—The Gorilla; by Lronarp J. Sanrorp, M.D. 
(Read before the Connecticut Academy of Arts and Sciences, December 18tb, 1861.) 
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